@article{MZM_1968_3_2_a7,
     author = {A. V. Nagaev and A. V. Startsev},
     title = {Threshold theorem for an~epidemic model},
     journal = {Matemati\v{c}eskie zametki},
     pages = {179--185},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_2_a7/}
}